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W. G. CHURCH.

DRILL HOLDER.

No. 489,847. Patented Jan. 10, 1893.

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VILLIAM G. CHURCH, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE WOODRUFFMANUFACTURING COMPANY, OF SAME PLACE'.

DRILL-HOLDER.

SPECIFICATION forming part of Letters Patent No. 489,847, dated January10, 1893.

l Application 'lled July 27, 1892. Serial No. 441,356. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM G. CHURCH, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Drill-Holders, of which the following is a full, clear,and exact description, whereby any one skilled in the art can make anduse the same.

` ing a drill.

The object of my invention is more particularly to provide a removabledrill holder applicable for use in connection with the ordinary drillingmachine, and to this end my invention consists in the details of theseveral parts making up the drill" holder as a whole, and in thecombination of such parts, as more particularly hereinafter describedand pointed out in the claims.

Referring to the drawings: Figure l is a detail view in lengthwisesection of the socket piece and in exterior view of the filling piece.Fig. 2 is a detail view in lengthwise section of the device illustratingthe manner of hold- Fig.3 is a detail view in horizontal section throughthe socket piece and cam ring showing the locking device.

The holder as a whole is adapted to be used in any form of drill pressor drilling machine in which there is a socket to receive and hold thetapered end of a drill.

\ In the accompanying drawings the letter d denotes the socket piece andb the filling piece that together make up and constitute the drillholder. The socket piece has a shank i c tapered and of convenient andusual shape chine.

for insertion in a chuck or the tapered socket in the spindle of a drillpress or drilling ma- The lower end of the socket piece forms a shell dhaving a cylindrical chamber d into which the lling piece b is removablyfitted. The inner end of the chamber is narrowed to receive the narrowedend b of the ill ing piece that is slabbed off so as to afford a holdingsurface that enables the iilling piece to be grasped so as to cause itto turn with the socket piece when the drill spindle is rotated. Thisfilling piece is preferably cylindrical in outline and has a taperedsocket b2 that is adapted to receive the tapered end of the shank oftheordinary drill e. A lling piece is provided for each of the severaldrills that are to be used and the drill is secured to the drill holderby thrusting the filling piece into the chamber in the socket piece andholding it there by means of the locking mechanism. This lattercomprises a sliding bolt f that eX- tends through the wall of the shelld with the inner end adapted to engage the groove b3 that is formed inthe surface of the filling piece and the outer end arranged to operatein connection witha camformedin the cam ring g. The bolt f is shoulderedso as to prevent its slipping through into the chamber in the shell andit is locked in place by passing it through the hole g made in the camring and then a turn of the latter carries the opening out ofregistration with the bolt and prevents the accidental removal of thelatter.

Within the cam ring g there is an annular groove g2 having on one edge acam surface g3 so located that when the cam ring is slid along thesurface of the shell in one direction it will tend to thrust the boltinward and cause it to engage the groove in the filling piece and thushold the parts firmly together against accidental removal lengthwise ofthe parts.

The device is particularly intended for use in upright drill spindles,and for that reason the cam is formed on the upper edge of the groove sothat the ring that is held downward by gravity will also tend to holdthe bolt f in engagement with the groove in the filling piece. The upperside of the groove b3 (see Fig. l of the drawings) or the inner end ofthe bolt f or both may be slightly beveled and in this instance todisengage the parts the ring is lifted and a slight pull upon thefilling piece will cause the bolt to be thrust outward and allow thepiece to be removed. In case the walls of the groove b3 and the sidesand e`nd of the pin f are made at right angles to each other todisengage the parts after the ring is lifted it will simply be necessaryto tip the tool over toward that side on which the pin is located, thismovement causing the pin to be disengaged from the bolt and allow thefilling piece to be removed. Another drill can then be inserted in thepress, the illing piece extending into the chamber in the shell.

By means of this device a large variety of drills can be convenientlysecured to the drill spindle of a drill press.

I claim as my invention:

1. In combination with the socket piece a.

comprising a shank c and shell d, the sliding cam ring mounted on theshell and having the interior groove With a cam g3, the bolt f,extending through a hole in the Wall of the shell and covered by thering, and the removable filling piece having an annular groove adaptedto receive the inner end of the bolt, all substantially as described.

2. In combination in a drill holder, a socket piece comprising a shankand shell, a bolt extending through the Wall of the shell, a sliding camring arranged upon the outside of the shell and having the boltoperating Cam, and the lling piece having an annular groove and a drillholding socket, all substantially as described.

3. In combination in a drill holder, asocket WILLIAM G. CHURCH.

Witnesses:

CHAS. L. BURDETT, JULIA STERN.

